关于yii分页组件的用法

public function actionIndex(){
  $user=User::model();
  //分页的使用
  $count=$user->count(); //获取总页数
  $pagesize=3; //每一页显示的记录条数
  $page=new Page($count,$pagesize);
  $sql="select * from {{user}} $page->limit";
  $info=$user->findAllBySql($sql);
  $show_page=$page->fpage();
  $this->renderPartial("index",array("info"=>$info,'show_page'=>$show_page));
}

<?php
/**
 * 分页类，以组件形式存在于componnets文件中
 */
class Page {
  private $total; //数据表中总记录数
  private $listRows; //每页显示行数
  private $limit;
  private $uri;
  private $pageNum; //页数
  private $config=array(&#39;header&#39;=>"个记录", "prev"=>"上一页", "next"=>"下一页", "first"=>"首 页", "last"=>"尾 页");
  private $listNum=8;
  /*
   * $total
   * $listRows
   */
  public function __construct($total, $listRows=10, $pa=""){
   $this->total=$total;
   $this->listRows=$listRows;
   $this->uri=$this->getUri($pa);
   $this->page=!empty($_GET["page"]) ? $_GET["page"] : 1;
   $this->pageNum=ceil($this->total/$this->listRows);
   $this->limit=$this->setLimit();
  }
  private function setLimit(){
   return "Limit ".($this->page-1)*$this->listRows.", {$this->listRows}";
  }
  private function getUri($pa){
   $url=$_SERVER["REQUEST_URI"].(strpos($_SERVER["REQUEST_URI"], &#39;?&#39;)?&#39;&#39;:"?").$pa;
   $parse=parse_url($url);
   if(isset($parse["query"])){
    parse_str($parse[&#39;query&#39;],$params);
    unset($params["page"]);
    $url=$parse[&#39;path&#39;].&#39;?&#39;.http_build_query($params);
   }
   return $url;
  }
  function __get($args){
   if($args=="limit")
    return $this->limit;
   else
    return null;
  }
  private function start(){
   if($this->total==0)
    return 0;
   else
    return ($this->page-1)*$this->listRows+1;
  }
  private function end(){
   return min($this->page*$this->listRows,$this->total);
  }
  private function first(){
      $html=&#39;&#39;;
   if($this->page==1)
    $html.=&#39;&#39;;
   else
    $html.=" <a href=&#39;{$this->uri}&page=1&#39;>{$this->config["first"]}</a> ";
   return $html;
  }
  private function prev(){
      $html=&#39;&#39;;
   if($this->page==1)
    $html.=&#39;&#39;;
   else
    $html.=" <a href=&#39;{$this->uri}&page=".($this->page-1)."&#39;>{$this->config["prev"]}</a> ";
   return $html;
  }
  private function pageList(){
   $linkPage="";
   $inum=floor($this->listNum/2);
   for($i=$inum; $i>=1; $i--){
    $page=$this->page-$i;
    if($page<1)
     continue;
    $linkPage.=" <a href=&#39;{$this->uri}&page={$page}&#39;>{$page}</a> ";
   }
   $linkPage.=" {$this->page} ";
   for($i=1; $i<=$inum; $i++){
    $page=$this->page+$i;
    if($page<=$this->pageNum)
     $linkPage.=" <a href=&#39;{$this->uri}&page={$page}&#39;>{$page}</a> ";
    else
     break;
   }
   return $linkPage;
  }
  private function next(){
      $html=&#39;&#39;;
   if($this->page==$this->pageNum)
    $html.=&#39;&#39;;
   else
    $html.=" <a href=&#39;{$this->uri}&page=".($this->page+1)."&#39;>{$this->config["next"]}</a> ";
   return $html;
  }
  private function last(){
      $html=&#39;&#39;;
   if($this->page==$this->pageNum)
    $html.=&#39;&#39;;
   else
    $html.=" <a href=&#39;{$this->uri}&page=".($this->pageNum)."&#39;>{$this->config["last"]}</a> ";
   return $html;
  }
  private function goPage(){
   return &#39; <input type="text" onkeydown="javascript:if(event.keyCode==13){var page=(this.value>&#39;.$this->pageNum.&#39;)?&#39;.$this->pageNum.&#39;:this.value;location=\&#39;&#39;.$this->uri.&#39;&page=\&#39;+page+\&#39;\&#39;}" value="&#39;.$this->page.&#39;" style="width:25px"><input type="button" value="GO" onclick="javascript:var page=(this.previousSibling.value>&#39;.$this->pageNum.&#39;)?&#39;.$this->pageNum.&#39;:this.previousSibling.value;location=\&#39;&#39;.$this->uri.&#39;&page=\&#39;+page+\&#39;\&#39;"> &#39;;
  }
  function fpage($display=array(0,1,2,3,4,5,6,7,8)){
   $html[0]=" 共有<b>{$this->total}</b>{$this->config["header"]} ";
   $html[1]=" 每页显示<b>".($this->end()-$this->start()+1)."</b>条，本页<b>{$this->start()}-{$this->end()}</b>条 ";
   $html[2]=" <b>{$this->page}/{$this->pageNum}</b>页 ";
   $html[3]=$this->first();
   $html[4]=$this->prev();
   $html[5]=$this->pageList();
   $html[6]=$this->next();
   $html[7]=$this->last();
   $html[8]=$this->goPage();
   $fpage=&#39;&#39;;
   foreach($display as $index){
    $fpage.=$html[$index];
   }
   return $fpage;
  }
}